CN104052281B - Switching regulator with adaptive PWM/PFM modulator - Google Patents
Switching regulator with adaptive PWM/PFM modulator Download PDFInfo
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- CN104052281B CN104052281B CN201410084858.0A CN201410084858A CN104052281B CN 104052281 B CN104052281 B CN 104052281B CN 201410084858 A CN201410084858 A CN 201410084858A CN 104052281 B CN104052281 B CN 104052281B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
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Abstract
The invention discloses a kind of switch voltage-stabilizing controller for step-down switching regulator and introduce a multi-mode self-adaptive modulator, for automatically selecting between the first operational mode and the second operational mode, as the function of initial output voltage.In one embodiment, output voltage and comparator reference voltage are made comparisons by switch voltage-stabilizing controller, for working under selected operational mode according to output voltage.In this case, it in multiple examples of electronic system, it is possible to use a single switch voltage-stabilizing controller, is that the circuit with different service requirement is powered.In one embodiment, configuring switch voltage-stabilizing controller, running under PWM/PFM pattern, PWM mode, as the function of output voltage, represents the circuit application for power supply for the switch voltage-stabilizing controller.
Description
Technical field
The present invention relates to a kind of integrated circuit fields, be specifically related to a kind of switching regulator with adaptive PWM/PFM modulator.
Background technology
Many consumer electronics products, such as TV set-top box and remote control device, as electronic system, all introduce integrated circuit.These electronic systems generally include the integrated circuit of the Digital Logical Circuits constituting core and the integrated circuit of composition input/output (I/O) interface circuit.Traditional electronic system utilizes multiple DC-to-dc converter, is converted into driving the one or more voltages needed for these integrated circuits from electric supply system by main bus-bar voltage.
Switched-mode power supply or switching regulator, also referred to as DC-to-dc converter, for being converted into output voltage required on the voltage level that integrated circuit is suitable in electronic system by input voltage source.For example, when powering for I/O interface circuit, it is necessary to the 12V voltage source of electronic system is down to 5V, when being core digital power logic circuitry, it is necessary to be down to 1V, all the more so if especially preparing core digital logic circuit if, with deep submicron integrated circuit.Switching regulator provides power supply function by low-loss element (such as capacitor, resistor and transformer etc.), and power switch switches on and off, and electric current is transferred to the output individually encapsulating from input.Utilizing feedback control circuit modulation energy transfer, the load that constant output voltage maintains circuit requirement limits interior.
Government organs have begun to implement standby power code, it is desirable to have a standby power function applies under stand-by power consumption pattern, should use the power of not higher than 1W.These " green " standards require that electronic equipment has power-efficient high in the case of low standby power loss.Power-efficient is to measure to realize, in addition to heat radiation, the power proportions that function is consumed.
When insertion switch voltage-stablizer in electronic system, standby power standard requires switching regulator high efficiency to be had in stand-by mode, such as, when standby when 5V, 10mA, efficiency is higher than 80%.Design switching regulator, when driving some specific " normally " load, transmision peak efficiency.Working under various load environment, the efficiency of switching regulator all can be impaired, and loss the most serious occurs under light load environment.Therefore, switching regulator to meet the standby power requirements under light load environment, it is common that highly difficult.
In the electronic system containing digital core circuitry and I/O interface circuit, digital core circuitry usually requires that high electric current, but work under low supply voltage (such as 1V), and I/O interface circuit usually requires that electric current is relatively low, but work under higher supply voltage (such as 5V or 3.3V).
Digital core circuitry requires that power supply can respond with rapid load transients, thus processes rapidly various load current transitions.Owing in stand-by mode, digital core is generally opened, so for standby modulation, the efficiency of digital core power supply is unimportant.Therefore, generally select and with the DC-to-dc converter of rapid load transients, and can not consider converter power efficiency when gently loading.In most cases, pulsewidth modulation (PWM) switching regulator is used to be that digital core circuitry is powered.
On the other hand, under the standby mode of operation, I/O interface circuit remains up.Therefore, I/O interface circuit requires that power supply can be normal load and light load transmission high efficiency.In order to meet the requirement of " green " standard, under standby mode, the power supply of I/O interface circuit must have high efficiency under light load environment.In most cases, pulse frequency modulation (PFM) switching regulator is applicable to high efficiency light load operation.
Therefore, in order to optimize performance requirement and the power efficiency needs of electronic system, different types of switching regulator can be used for digital core circuitry and I/O interface circuit, designs electronic system.The manufacturer of electronic system must research and develop the solution of various DC-to-dc converter, and this can make design and manufacture process more complicated, and cost performance is very low.
Content of the invention
It is an object of the invention to provide a kind of switching regulator with adaptive PWM/PFM modulator, this switching regulator can meet the standby power requirements under light load environment, it may also be used for fast transient.
For reaching above-mentioned purpose, the invention provides a kind of switch voltage-stabilizing controller for step-down switching regulator, this switching regulator receives input voltage, control high-end switch and low-end switch, utilizing feedback control loop, producing switched voltage output, this switched voltage output produces modulation output voltage for LC filter circuit, this modulation output voltage has substantially invariable amplitude at output node, and this controller includes:
One comparator, for receiving the first feedback voltage representing modulation output voltage, with comparator reference voltage, comparator produces and selects signal, when the first feedback voltage is more than comparator reference voltage, determine and select signal, when the first feedback voltage is less than comparator reference voltage, uncertain selection signal；And
One control circuit, for receiving the second feedback voltage representing modulation output voltage, and receive selection signal, control circuit is according to selection signal, can work under the first operational mode or the second operational mode, control circuit can also work under selected operational mode, produces gate drive signal, for controlling high-end switch and low-end switch
Wherein determining and selecting signal, configure control circuit, run in the first operating mode, uncertain selection signal, configuration control circuit is run in the second operating mode.
Above-mentioned switch voltage-stabilizing controller, wherein, configures control circuit, runs PWM/PFM pattern in the first operating mode, run PWM mode in the second operating mode.
Above-mentioned switch voltage-stabilizing controller, wherein, selects signal to include enabling signal for PFM pattern, determine and enable signal, start PFM pattern by PWM mode under the first operational mode, uncertain enable signal, make PFM pattern unavailable, PWM mode can only be used in the second operating mode.
Above-mentioned switch voltage-stabilizing controller, wherein, selects comparator reference voltage so that it is the circuit that magnitude of voltage is powered to modulation output voltage is related.
Above-mentioned switch voltage-stabilizing controller, wherein, the first feedback voltage is modulation output voltage, selects comparator reference voltage to make its magnitude of voltage between the supply voltage used by the supply voltage used by core circuit and input-output interface circuit.
Above-mentioned switch voltage-stabilizing controller, wherein, comparator reference voltage includes the magnitude of voltage between 2V and 3V.
Above-mentioned switch voltage-stabilizing controller, wherein, control circuit includes:
One error amplifier, for receiving the second feedback voltage and the first reference voltage, error amplifier produces error output valve；
One PWM comparator, is used for receiving error output valve and tilt signals, and PWM comparator produces pwm control signal；
One PFM comparator, for receiving the second feedback voltage and the second reference voltage, PFM comparator produces PFM control signal；And
One PWM/PFM control logic circuit, is used for receiving pwm control signal, PFM control signal and selection signal, and PWM/PFM control logic is that power switch produces gate drive signal.
Above-mentioned switch voltage-stabilizing controller, wherein, configuration control circuit is run in the first operating mode and is run under the second operational mode, and the first operational mode optimizes for the light load efficiency under standby mode, and fast transient response is optimized by the second operational mode.
Above-mentioned switch voltage-stabilizing controller, wherein, selects comparator reference voltage so that it is magnitude of voltage represents the supply voltage used by core circuit and the magnitude of voltage between the supply voltage used by input-output interface circuit.
Above-mentioned switch voltage-stabilizing controller, wherein, when the first feedback voltage is higher than comparator reference voltage, determines and selects signal, choose optimized first operational mode of the light load efficiency under standby mode；When the first feedback voltage is less than comparator reference voltage, uncertain selection signal, choose optimized second operational mode to fast transient response.
Present invention also offers a kind of switch voltage-stabilizing controller method for step-down switching regulator, switching regulator receives input voltage, control high-end switch and low-end switch, utilize feedback control loop, producing switched voltage output, switcher input voltage is used for LC filter circuit, produces modulation output voltage, output voltage has substantially invariable amplitude at output node, and the method includes:
Relatively represent the first feedback voltage and the comparator reference voltage of modulation output voltage；
When the first feedback voltage is higher than comparator reference voltage, produce the selection signal determining, when the first feedback voltage is less than comparator reference voltage, uncertain selection signal；
Receive the second feedback voltage representing modulation output voltage；
Select the first operational mode when determining and selecting signal；
When uncertain selection signal, select the second operational mode；And
Produce gate drive signal, be used for controlling high-end switch and low-end switch.
Above-mentioned method, wherein, selects the first operational mode when determining and selecting signal, including select PWM/PFM pattern when determining and selecting signal；And when uncertain selection signal, select the second operational mode, including select PWM mode when uncertain selection signal.
Above-mentioned method, wherein, selects signal to include the signal that enables for PFM pattern, and the method includes:
When determining selection signal, PFM pattern can be used；And
When uncertain selection signal, PFM pattern is unavailable.
Above-mentioned method, wherein, the first feedback voltage is modulation output voltage, selects comparator reference voltage so that it is magnitude of voltage is between the supply voltage used by the supply voltage used by core circuit and input-output interface circuit.
Above-mentioned method, wherein, selects the first operational mode when determining and selecting signal, including when determining selection signal, select optimized first operational mode of light load efficiency under standby mode；Select the second operational mode when uncertain selection signal, including when uncertain selection signal, select optimized second operational mode to fast transient response.
Self-adaptive switch voltage-stabilizing controller of the present invention has the advantage that many is better than traditional solution.Exactly, self-adaptive switch voltage-stabilizing controller both may be used for fast transient, it is also possible to for light load environmental requirement.Therefore, electronic system can use single switching regulator, drive core circuit or interface I/O circuit.Self-adaptive switch voltage-stabilizing controller simplifies system design, reduces cost.More precisely, self-adaptive switch voltage-stablizer of the present invention makes single switch voltage-stabilizing controller may be used for all power required in whole electronic system.So can simplify logical operation, improve the operating efficiency of Electronic system manufacturers.
Brief description
Further detail below and accompanying drawing propose each embodiment of the present invention.
Fig. 1 represents in traditional electronic system, the block diagram of power supply architecture.
Fig. 2 represents the self-adaptive switch voltage-stabilizing controller utilizing described in embodiments of the invention, introduces the block diagram of the power supply architecture of DC-to-dc converter in electronic system.
Fig. 3 represents the switched voltage output when PWM mode and PFM MODE of operation for the switch voltage-stabilizing controller and corresponding inductive current.
Fig. 4 represents in an embodiment of the present invention, introduces the schematic diagram of adaptive switch voltage-stabilizing controller in DC-to-dc converter.
Detailed description of the invention
The present invention can realize in every way, including as a technique；A kind of device；One system；And/or one composition of matter.In this manual, any one other modes that these implementations or the present invention may use, can be referred to as technology.In general, the order of described processing step can be converted within the scope of the invention.
The detailed description of one or more embodiments of the invention and accompanying drawing explain the principle of the present invention.Although, the present invention proposes together with these embodiments, but the scope of the present invention is not limited to any embodiment.The scope of the present invention is limited only by the appended claims, and the present invention comprises plurality of optional scheme, correction and equivalents.In the following description, the various details being proposed are for understanding the present invention comprehensively.These details are used for illustrating, it is not necessary to the part details in these detail or full details, only in accordance with claims, it is possible to realize the present invention.For simplicity, in correlative technology field of the present invention, widely-known technique material does not has detailed description, in order to avoid produce unnecessary obscuring to the present invention.
In an embodiment of the present invention, adaptive switch voltage-stabilizing controller introduces a multi-mode self-adaptive modulator, for automatically selecting between the first modulating mode and the second modulating mode, as the function of output voltage generation.In an embodiment of the present invention, utilize self-adaptive switch voltage-stabilizing controller to prepare switching regulator or DC-to-dc converter, receive input voltage and produce output voltage, drive load.The output voltage that self-adaptive switch voltage-stabilizing controller monitoring DC-to-dc converter produces, and automatically configure self-adaptive modulator, run under required mode of operation according to output voltage.It in such a case, it is possible to utilize single switch voltage-stabilizing controller, in multiple examples of electronic system, is that the circuit with different operating requirement is powered.
In one embodiment, self-adaptive switch voltage-stabilizing controller introduces adaptive PWM/PFM modulator, according to the output voltage producing, can automatically configure, work under PWM pattern or PFM modulating mode.When output voltage represents the quick transient response of circuit needs, select PWM mode, when output voltage represents that circuit needs high efficiency under light load environment, then select PFM pattern.
Self-adaptive switch voltage-stabilizing controller of the present invention has the advantage that many is better than traditional solution.Exactly, self-adaptive switch voltage-stabilizing controller both may be used for fast transient, it is also possible to for light load environmental requirement.Therefore, electronic system can use single switching regulator, drive core circuit or interface I/O circuit.Self-adaptive switch voltage-stabilizing controller simplifies system design, reduces cost.More precisely, self-adaptive switch voltage-stablizer of the present invention makes single switch voltage-stabilizing controller may be used for all power required in whole electronic system.So can simplify logical operation, improve the operating efficiency of Electronic system manufacturers.
Fig. 1 represents the block diagram of power supply architecture in traditional electronic system.Seeing Fig. 1, electronic system 10 receives 12V input, as input voltage vin.When drive system occurs different circuit, it is necessary to reduce input voltage vin.For example, digital core circuitry needs the power supply Vcore of 1V, and input/output (I/O) interface circuit needs the power supply Vio of 5V.Digital core circuitry usually requires that fast transient responds.Therefore, it is achieved the DC-to-dc converter 14 of pulsewidth modulation (PWM) pattern is generally used for producing core power Vcore.But, the DC-to-dc converter with PWM modulator is generally of very poor light load efficiency.
For I/O interface circuit, the DC-to-dc converter 12 of the double PWM mode of commonly used realization or PWM/PFM pattern.When load environment be medium to heavy duty when, DC-to-dc converter 12 works in a PWM mode, transmit high efficiency.When loading environment and being light, DC-to-dc converter 12 is in PFM(pulse frequency modulation) MODE of operation, transmits high efficiency.The speed of the conversion between PWM mode unhappy under PFM pattern and heavy duty environment under light load environment.But, typical load in I/O interface circuit will not be changed quickly, therefore can allow between PFM and PWM mode transient response slowly.
So, in order to meet the requirement of the response of fast transient in core circuit, and high efficiency green standard when standby in I/O interface circuit, electronic system 10 needs two distinct types of DC-to-dc converter.The logical operation manufacturing electronic system 10 becomes more complicated.
Fig. 2 represents the self-adaptive switch voltage-stabilizing controller utilizing described in embodiments of the invention, introduces the power supply architecture block diagram of the electronic system of DC-to-dc converter.Seeing Fig. 2, electronic system 20 receives input voltage vin (such as 12V).Electronic system 20 includes by core power Vcore(such as 1V) digital core circuitry powered, and by I/O power supply Vio(such as 5V) input/output (I/O) interface circuit powered.Therefore electronic system 20 utilizes two DC-to-dc converters the 22nd, 24, and input voltage vin is converted into required builtin voltage Vcore and Vio.In an embodiment of the present invention, by adaptive PWM/PFM modulator, utilize self-adaptive switch voltage-stabilizing controller, be respectively configured DC-to-dc converter the 22nd, 24.Utilize same self-adaptive switch voltage-stabilizing controller, prepare DC-to-dc converter 22, produce I/O supply voltage Vio, and prepare DC-to-dc converter 24, produce core power supply voltage Vcore.Each DC-to-dc converter the 22nd, 24 output voltage producing, all as output feedback voltage VOFB, feed back to self-adaptive switch voltage-stabilizing controller, configure adaptive PWM/PFM modulator, run under the modulating mode required for power supply circuits.
For example, when output voltage is I/O supply voltage Vio, voltage Vio(such as 5V) feed back in the self-adaptive switch voltage-stabilizing controller in DC-to-dc converter 22, configuration PWM/PFM modulator runs under double PWM/PFM patterns.In this case, utilize PWM mode, when weight or medium load, it is achieved that high efficiency, utilize PFM to modulate simultaneously, also achieve high efficiency when light load.
On the other hand, when output voltage is core power supply voltage Vcore, voltage Vcore(such as 1V) feed back in the self-adaptive switch voltage-stabilizing controller in DC-to-dc converter 24, configuration PWM/PFM modulator runs in a PWM mode.In this case, core circuit is while work, it is thus achieved that high efficiency and quick transient response.When electronic system 30 enters standby mode, the core circuit including DC-to-dc converter 24 can be used.Due to circuit under the standby environment of light load unavailable, the therefore light load efficiency of DC-to-dc converter 24 inapplicable.
In one embodiment, self-adaptive switch voltage-stabilizing controller uses comparator, compares output feedback voltage VOFBAnd reference voltage, to select required mode of operation.For example, owing to digital core circuitry typically requires very low supply voltage (such as 1V), I/O interface circuit typically requires higher supply voltage (such as 5V).Self-adaptive switch voltage-stabilizing controller will compare output feedback voltage VOFBWith the reference voltage of 3V, to determine that controller is used for driving core circuit or I/O interface circuit.When output feedback voltage VOFBDuring less than reference voltage, controller confirms that switching regulator is used for driving digital core circuitry, and selects PWM mode.When output feedback voltage VOFBDuring more than reference voltage, controller confirms that switching regulator is used for driving I/O interface circuit, and selects PWM/PFM pattern.
Fig. 3 represents when PWM mode and PFM MODE of operation, the switched voltage output of switch voltage-stabilizing controller and corresponding inductive current.PWM is at switched voltage output Vsw(curve 44) achieve conduction continuously, to produce linear tilt inductive current I at continuous switchL(curve 42).Either under heavy duty still light load environment, switched voltage output can switch continuously.Therefore, PWM mode can be under light load environment, it is achieved quick transient response, but efficiency is very low.
PFM pattern is at switched voltage output Vsw(curve 48) place that switches at low frequency, it is achieved that discontinuously conduct, inductive current IL(curve 46) damages linear tilt capabilities.Switching frequency after reduction improves the efficiency under light load condition, but owing to PFM pattern requires time for the change of responsive load situation, therefore very poor transient response can affect switching frequency.
Fig. 4 represents the schematic diagram in an embodiment of the present invention, being incorporated into self-adaptive switch voltage-stabilizing controller in DC-to-dc converter.Seeing Fig. 4, step-down switching regulator 50 contains a self-adaptive switch voltage-stabilizing controller 60(" controller 60 "), controller 60 contains a pair power switch S1 and S2, is connected between input voltage vin and ground voltage.Power switch S1 and S2 is optional to be switched on and off, in order to produce switched voltage output Vsw at switching node (SW) 69s.Switched voltage output Vsw is directly coupled on LC filter circuit,LCFilter circuit contains an output inductor L1 and output capacitor C1, produces output voltage V at node 70sOUT, there is substantially invariable amplitude.It is then possible to utilize output voltage VOUTDrive load 80.
In the present note, controller 60 is as integrated circuit.Power switch is formed on the integrated, and as controller 60, and output inductor L1 and output capacitor C1 is as from piece independent component.In other embodiments, power switch and output inductor/output capacitor can be formed on the piece of controller IC or from piece.The definite level of integrated step-down switching regulator 50 is unimportant for the enforcement of the present invention.
Switching regulator 50 includes a feedback control circuit, and Modulation Transfer arrivesLCEnergy on filter circuit, by output voltage stabilization in the load required for circuit limits.More precisely, feedback control circuit makes power switch S1 and S2 switch on and off, modulate output voltage VOUTIt equal to reference voltage, or is equal to the magnitude of voltage related to reference voltage.In the present embodiment, the divider containing resistor R1 and R2 is utilized to divide output voltage VOUT, then as the feedback voltage V on feedback node 72FB, feed back to controller 60.In addition, in order to implementation pattern selects, output voltage VOUTAlso serve as the output feedback voltage V on feedback node 74OFB, feed back to controller 60.
Controller 60 includes an error amplifier 62, receives feedback voltage VFBWith reference voltage VREF1.The output voltage of error amplifier 62 is used for PWM comparator 63, makes comparisons with tilt signals.The output of PWM comparator 63 is the pwm control signal being coupled to PWM/PFM control logic circuit 64.Error amplifier 62 and PWM comparator 63 is for the FEEDBACK CONTROL under PWM pattern.
Controller 60 also includes a PFM comparator 65, receives feedback voltage VFBWith reference voltage VREF2.The output of PFM comparator 65 is the PFM control signal being coupled to PWM/PFM control logic circuit 64.PFM comparator 65 is for the FEEDBACK CONTROL under PFM modulating mode.
PWM/PFM
Control logic circuit 64 also receives clock signal, as input.PWM/PFM control logic circuit 64 produces gate drive signal, is used for high-end drive circuit 67 and low-side driver circuitry 68, drives high-end power switch S1 and low side power switch S2 respectively.In certain embodiments, gate drive signal is supplementary signal.When the control signal that PWM comparator 63 or PFM comparator 65 sends triggers, control logic circuit 64 switches on and off high-end power switch S1.
Finally, controller 60 also includes a comparator 66, receives output feedback voltage VOFBWith comparator reference voltage VCOM.Comparator 66 produces the PFM_ being coupled on PWM/PFM control logic circuit 64 and enables signal.When output feedback voltage VOFBMore than comparator reference voltage VCOMWhen, comparator 66 determines that PFM_ enables signal.Otherwise uncertain PFM_ is enabled signal.In certain embodiments, when PFM_ enable signal determine when, configure PWM/PFM control logic circuit 64
Run under PWM/PFM pattern.It is to say, enable PFM pattern.When PFM_ enable signal uncertain when, configure PWM/PFM control logic circuit 64
Run under PWM mode.Meaning, PFM pattern is unavailable.
In some embodiments it is possible to using PWM mode as the PWM mode of constant frequency, or the PWM mode as variable frequency Constant on-time or constant off-time.
In certain embodiments, comparator reference voltage VCOMMagnitude of voltage between 2V and 3V.In certain embodiments, comparator reference voltage VCOMMagnitude of voltage be 3V or 2.7V, this core circuit 1V run and I/O interface circuit in the electronic system that 5V runs highly useful.No matter whether switching regulator 50 is used for is core circuit or I/O interface circuit is powered, the comparator reference voltage V of 3V or 2.7VCOMCan easily obtain.PWM/PFM control logic circuit 64, enables signal according to PFM_, and PWM/PFM control logic circuit 64 Configuration Control Unit 60 runs under suitable modulating mode, powers for circuit.
In one embodiment, when output feedback voltage VOFBMore than comparator reference voltage VCOMWhen, switching regulator 50 provides supply voltage for the I/O interface circuit for electronic system.Determining that PFM_ enables signal, Configuration Control Unit 60 runs under PWM/PFM pattern, during for high efficiency, heavy duty, uses PWM mode, during for high efficiency, gently load, uses PFM pattern.
On the other hand, when output feedback voltage VOFBLess than comparator reference voltage VCOMWhen, the digital core circuitry that switching regulator 50 is electronic system provides supply voltage.It is uncertain that PFM_ enables signal, and Configuration Control Unit 60 only runs in a PWM mode, high efficiency required during for powering for core circuit and fast transient response.
Therefore, in electronic system in single example, it is possible to use identical switch voltage-stabilizing controller 60, supply voltage is produced for different circuit.The manufacturer of electronic system is without laying in different types of switching regulator or switch voltage-stabilizing controller.Self-adaptive switch voltage-stabilizing controller of the present invention can use unified switching regulator to design, and reduces manufacturing cost and design complexities.
In the embodiment shown in fig. 4, output voltage VOUTDirectly feed back to controller 60, as feedback voltage, with comparator reference voltage VCOMCompare.In other embodiments, output voltage V can be reducedOUT, produce and output voltage VOUTRelevant output feedback voltage.
In addition, in the above-described embodiments, configuration self-adaptive switch voltage-stabilizing controller 60 can run under PWM mode or PWM/PFM pattern.In other embodiments, configuring self-adaptive switch voltage-stabilizing controller 60 to run in the first operating mode, the first operational mode optimizes for the light load efficiency under standby mode, and under the second operational mode that fast transient response has been optimized.In other embodiments, self-adaptive switch voltage-stabilizing controller 60 can use any operational mode needed for electronic system.
Although for sake of clarity, embodiment is described in detail by above content, but the invention is not limited in above-mentioned details.Implement the present invention and also have plurality of optional scheme.Embodiment in Wen is only used for illustrating, and is not used in limitation.
Claims (9)
1. the switch voltage-stabilizing controller for step-down switching regulator, this switching regulator receives input voltage, control high-end switch and low-end switch, utilize feedback control loop, produce switched voltage output, this switched voltage output produces modulation output voltage for LC filter circuit, and this modulation output voltage has substantially invariable amplitude at output node, and this controller includes:
One comparator, for receiving the first feedback voltage representing modulation output voltage, with comparator reference voltage, comparator produces and selects signal, when the first feedback voltage is more than comparator reference voltage, select signal effective, when the first feedback voltage is less than comparator reference voltage, select invalidating signal；Wherein, first feedback voltage is this modulation output voltage, selecting comparator reference voltage to make its magnitude of voltage between the first positive voltage used by core circuit and the second positive voltage used by input-output interface circuit, this first positive voltage is less than this second positive voltage；And
One control circuit, for receiving the second feedback voltage representing modulation output voltage, and receive selection signal, control circuit is according to selection signal, can work under the double PWM/PFM of the first operational mode or the second operational mode PWM, control circuit can also work under selected operational mode, produces gate drive signal, for controlling high-end switch and low-end switch
Wherein, the result according to comparator, when selecting signal effective, configures control circuit, runs, produce the modulation output voltage representing the second positive voltage for input-output interface circuit under the double PWM/PFM of the first operational mode；According to the result of comparator, when selecting invalidating signal, configuration control circuit is run under the second operational mode PWM, produces the modulation output voltage representing the first positive voltage for core circuit;Wherein, when control circuit is run under the double PWM/PFM of the first operational mode, use PWM mode under weight or middle loading condition, use PFM pattern under light load conditions, produce the modulation output voltage representing the second positive voltage for input-output interface circuit;
Wherein, when selecting the first operational mode, as the response to the modulation output voltage representing the second positive voltage for input-output interface circuit selecting signal effectively to indicate, control circuit is maintained at the first operational mode and is not necessarily to be transformed into the second operational mode；
When selecting the second operational mode, as the response of the modulation output voltage representing the first positive voltage for core circuit indicating selection invalidating signal, control circuit is maintained at the second operational mode and is not necessarily to be transformed into the first operational mode.
2. switch voltage-stabilizing controller as claimed in claim 1, it is characterized in that, signal is selected to include enabling signal for PFM pattern, enable signal effective, start PFM pattern by the PWM mode under the first operational mode, enable invalidating signal, make PFM pattern unavailable, PWM mode can only be used in the second operating mode.
3. switch voltage-stabilizing controller as claimed in claim 1, it is characterised in that comparator reference voltage includes the magnitude of voltage between 2V and 3V.
4. switch voltage-stabilizing controller as claimed in claim 1, it is characterised in that control circuit includes:
One error amplifier, for receiving the second feedback voltage and the first reference voltage, error amplifier produces error output valve；
One PWM comparator, is used for receiving error output valve and tilt signals, and PWM comparator produces pwm control signal；
One PFM comparator, for receiving the second feedback voltage and the second reference voltage, PFM comparator produces PFM control signal；And
One PWM/PFM control logic circuit, is used for receiving pwm control signal, PFM control signal and selection signal, and PWM/PFM control logic is high-end switch and low-end switch produces gate drive signal.
5. switch voltage-stabilizing controller as claimed in claim 1, it is characterised in that configuration control circuit is run to optimize the light load efficiency under standby mode under PFM pattern, runs in a PWM mode to optimize fast transient response.
6. switch voltage-stabilizing controller as claimed in claim 5, it is characterised in that when the first feedback voltage is higher than comparator reference voltage, selects signal effective, chooses the PFM pattern of optimized first operational mode of the light load efficiency under standby mode；When the first feedback voltage is less than comparator reference voltage, select invalidating signal, choose the PWM mode of optimized second operational mode to fast transient response.
7. the switch voltage-stabilizing controller method for step-down switching regulator, switching regulator receives input voltage, control high-end switch and low-end switch, utilize feedback control loop, producing switched voltage output, this switched voltage output is used for LC filter circuit, produces modulation output voltage, output voltage has substantially invariable amplitude at output node, and the method includes:
Relatively represent the first feedback voltage and the comparator reference voltage of modulation output voltage；Wherein, first feedback voltage is this modulation output voltage, selecting comparator reference voltage to make its magnitude of voltage between the first positive voltage used by core circuit and the second positive voltage used by input-output interface circuit, this first positive voltage is less than this second positive voltage；
When the first feedback voltage is higher than comparator reference voltage, produces effective selection signal, when the first feedback voltage is less than comparator reference voltage, produce invalid selection signal；
Receive the second feedback voltage representing modulation output voltage；
Select the double PWM/PFM pattern of the first operational mode when selecting signal effective；
When selecting invalidating signal, select the second operational mode PWM mode；And
Produce gate drive signal, be used for controlling high-end switch and low-end switch；
As to the response selecting the first operational mode, produce the modulation output voltage using double PWM/PFM pattern representing the second positive voltage for input-output interface circuit；Wherein, the modulation output voltage producing the double PWM/PFM pattern of use includes that using PWM mode to produce under weight or middle loading condition modulates output voltage and use PFM pattern to produce modulation output voltage under light load conditions；
As to the response selecting the second operational mode, produce the modulation output voltage of the use PWM mode representing the first positive voltage for core circuit；
When selecting the first operational mode, as the response to the effective modulation output voltage representing the second positive voltage for input-output interface circuit selecting signal designation, the first operational mode is used to produce modulation output voltage without being transformed into the second operational mode；
When selecting the second operational mode, as the response of the modulation output voltage representing the first positive voltage for core circuit to invalid selection signal designation, the second operational mode is used to produce modulation output voltage without being transformed into the first operational mode.
8. method as claimed in claim 7, it is characterised in that selecting signal to include the signal that enables for PFM pattern, the method includes:
When selecting signal effective, PFM pattern can be used；And
When selecting invalidating signal, PFM pattern is unavailable.
9. method as claimed in claim 7, it is characterised in that select the first operational mode when selecting signal effective, including when selecting signal effective, select light load efficiency optimized PFM pattern under standby mode；Select the second operational mode when selecting invalidating signal, including when selecting invalidating signal, select the optimized PWM mode to fast transient response.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| US13/801,755 | 2013-03-13 | ||
| US13/801,755 US9401637B2 (en) | 2013-03-13 | 2013-03-13 | Switching regulator with adaptive PWM/PFM modulator |
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| CN104052281A CN104052281A (en) | 2014-09-17 |
| CN104052281B true CN104052281B (en) | 2016-10-05 |
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| CN (1) | CN104052281B (en) |
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Also Published As
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| US9401637B2 (en) | 2016-07-26 |
| CN104052281A (en) | 2014-09-17 |
| TW201439705A (en) | 2014-10-16 |
| US20140266090A1 (en) | 2014-09-18 |
| TWI599869B (en) | 2017-09-21 |
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